This video goes over the inside of a door handle that you would use in your house.  Specific details will vary for different door handles. Parts covered in this video: handle, rosette, latch, latch assembly, and locking mechanism. The locking mechanism was simplified a lot. If you were to take a real one part you would find a lot more intricate parts.

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Watch more videos:
How the Apollo Spacecraft works: https://youtu.be/8dpkmUjJ8xU
How does a Clicky Pen work?: https://youtu.be/Zv5Qa2kGL04

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Music: "Turn On" By R.J. Smith (Youtube audio library)

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